Eaton / Cutler-Hammer NDC312T35W Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer NDC312T35W - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for demanding industrial environments, this 1200A three-pole molded case circuit breaker features an advanced microprocessor-based design. The N-Frame unit provides reliable power distribution and circuit protection for heavy-duty commercial facilities. It installs into Eaton Series C panelboards, motor control centers, and switchboards.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | NDC312T35W |
| Series | NDC |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 600-1200A |
|---|
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSG |
| Trip Function | Long-Time, Short-Time, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Rating Plugs, Lug Kits |
|---|---|
| Accessories | Without Terminals |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, True RMS Sensing, 80% Rated |
Product FAQs
9 answersDoes the NDC312T35W require a rating plug to operate?
Yes, this N-Frame breaker with the Digitrip RMS 310+ trip unit requires a compatible rating plug to establish the maximum continuous current rating for your application. The rating plug must be installed before the breaker is put into service.
What does the LSG designation mean on the NDC312T35W trip unit?
The LSG designation indicates the Digitrip RMS 310+ electronic trip unit features adjustable Long-Time, Short-Time, and Ground-Fault protection. This allows for precise curve shaping and coordination with other breakers in your system.
Can I use the NDC312T35W in a 100% rated application?
No, standard NDC breakers like the NDC312T35W are 80% rated. For a 100% rated application, you would need a breaker with a "C" prefix in the catalog number, such as a CNDC frame.
Does the NDC312T35W include a neutral current sensor for ground fault protection?
No. If your system neutral is grounded and phase-to-neutral loads are used, a separate neutral current sensor must be purchased and connected to the trip unit to ensure proper ground fault sensing.
How does the ground fault protection work on the NDC312T35W?
The Digitrip RMS 310+ trip unit detects ground fault currents through residual sensing. It is not designed to use source ground or zero sequence ground fault sensing methods.
Can the trip unit on the NDC312T35W be replaced in the field?
No, Series C N-Frame circuit breakers have the trip unit built in as an integral part of the breaker. The trip unit is not field replaceable.
Can the NDC312T35W replace older Westinghouse N-Frame breakers?
Yes, Eaton and Cutler-Hammer Series C breakers are direct replacements for legacy Westinghouse Series C breakers with matching frame sizes and specifications.
Can the NDC312T35W be reverse fed?
Yes, Eaton Series C N-Frame circuit breakers are suitable for reverse feed applications.
Is the NDC312T35W HACR rated?
Yes, all Eaton Series C N-Frame circuit breakers, including the NDC312T35W, are HACR (Heating, Air Conditioning, and Refrigeration) rated for use with HVAC equipment.
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